Subject:
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Re: librcx & interrupt handler
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Newsgroups:
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lugnet.robotics.rcx
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Date:
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Thu, 29 Aug 2002 09:30:17 GMT
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Viewed:
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2610 times
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hi,
I have another question about interrupt handlers. I would like to know how
(if it is possible) I could call the ROM OCIA handler. The reason is that I
would like to execute a small task periodicaly but if I simply redirect the
OCIA handler (VECTOR_OCIA = my_function()), the ROM OCIA handler is not
called (that's the point of redirection :-). So I thought that if I called
the ROM handler from my_function(), something like this:
void my_function() {
do_my_stuff();
call_the_ROM_handler();
}
and in the main:
int main(void) {
init_timer(...);
init_power();
VECTOR_OCIA = my_function();
...
}
I thought that it my do the trick. Now my question is how do I call the ROM
handler. I checked the adress in the doc you linked me to (it's 0x36ab), but
i don't exacly know how to call it... it's probably something in assembly,
like "jmp 0x36ab"... can you help me there?
Thanx
Cédric
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Message has 1 Reply:
 | | Re: librcx & interrupt handler
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| (...) You can do this in C. ((void(*)(void))0x36ab)(); (void(*)(void)) is a cast to make 0x36ab a pointer to a void function with no parameters. You then take that and use it as a function. You still have to be careful about register usage and use (...) (22 years ago, 29-Aug-02, to lugnet.robotics.rcx)
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Message is in Reply To:
| | Re: librcx & interrupt handler
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| (...) The ROM already supports a buffer size of 1 if that is enough for you. The ROM receives a message asynchronously into that buffer, and you can check it whenever you like and respond accordingly. The code I linked to should help you with buffer (...) (22 years ago, 28-Aug-02, to lugnet.robotics.rcx)
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